Loading and unloading device



W. A. CAMPBELL.

LOADING AND UNLOADING DEVICE.

APPLICATION FILED JUNE 8. 1920.

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To al lwho mc'tmag concern Be it known that- I, WI LIAM A. CAMP- BELL, a citizen of the United States of America, and resident ofGrenada, in. the

county of Grenada and State of Mississippi, have invented certain newand useful Improvements in Loading and-Unloading Devices, ofwhich the following is a specification. r

"This invention relates'to loading and un-.

loading devices andfparticularly a): an. extensible mast arm. the said; invention having for its object 1 the-provision of novel means for loading and unloading box cars and other closures, and the said device is also of utility in storehouses where loads are to be taken into the storehouses and placed at remote spots from the door. 'In

.fact, the utilityof the device is manifold,

and I do not wish to be limited with respect to its application.

A further object ofthis invention is; to

produce an arm of the character indicated which can be extended for the purpose of receiving or delivering a load and whichv can be restricted 1n length so that it can be swung into an'opening such as a door and again extended or projected to deposit the load at a spot remote from the door or opening.

in which the adjustment can be speedily attained. I With the foregoing and other objects in view, the invention consists in the details of construction and in. the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, ref-.

erence -will be had to the accompanying drawings forming part of this specification wherein like characters denote correspond:

,ing parts in the several views, and in wh1ch- Figure 1 illustrates a view in elevation ages for installing the device,

A still further object of this inventionis j to produce a device of the character ind1- cated which has adjustability vertically and Samara of Letters Patent. Pate ted Nov. 23,1920.

- Application filed June a, ean. I 'Se rla1 No.'387,443.

is, of course, to be secured in an upright position in any appropr atemanner. however, themanner of securing it is 1mmaterial and does not constitutea 'partrof.

the invention, the details'of this arrangement are not disclosed.. .The collars 7 and 8 are movable vertically of the shaft'and 1 J.

constitute bearings whichare engaged by anti-frictionmembers 9, such as balls, which; may rotate in raceways formed in the faces of the said collars. The collars also have apertured lugs or ears 10 and 11' respec tively. The walls of these apertures are threaded to engage a'screw 12 which screw r is rotatably mounted in heads 13 and l l at 1 4 ENT OFFICE. I

shaft opposite ends of the shaft 5. The screw] may be provided with an operating hand wheel 15 so that the collars may be raised and lowered for adjusting the position of the operatingparts of the mast arm, as will presently appear.

There is a short arm 16 which has a head I 17 whichis apertured and rotatably mounted on the shaft 5 between the bearings, and

the outer end of the arm has plates 18'and ciding apertures 20 to receive-a pivot 21.

The telescopic portion of the arm com-.

prises an inner section 22 having an apertured head 23 mounted on the pivot-21 and a series of telescopicfsections 24, 25, 26 and 27 or such numbcras requirements of practice may dictate. Each'of the projecting telescopic sections has atits outer end an inclosing ring 28, the aperture of which is slightly larger than the diameter of the sec% 'tion which mo eswith relation to it, and

31 are seated, the said balls being of a di- 19 secured to it, the said plates projecting beyond the end of the arm and having coinameter greater than the thickness. of the bearing ring so that the peripheries of the balls travel on the inner surface of the larger section and the outer surface of the smaller, section whichtelescopes with relation to the larger section. The said smaller section has on its inner end, an abutment ring 32 which is adapted to strike the inner V end of the ring 29 as the telescopic section V is moved outwardly, carrying with it the bearing ringso that the outwardly extend- 5 ing telescopic section is rigidly held by reason of the fact that there are anti-friction balls at the outer end of the-bearing rlng as Well as at theinner end thereofland the outwardly projecting telescopic section is supported so that lost'motionv is pre-l shaft, an arm oscillatably mounted With reelation to the said shaft, telescopically arranged members, means for pivotally con necting the-innermost ofthe said members tothe said arm,ant1-ir1ct1on members interposed'betiveen' the smaller and larger sections,.means on each larger section for limiting the-movement of the antririction device, and means on each smaller section for engaging the said anti-friction device for limitingthe movement of the said smaller section. r

2, In a loading'and unloading device, a shaft, collars 'sli'dable thereon, means for holding the collars in spaced relation to each other and for moving them simultaneously on the ish-aft,-an arm having a head mounted to oscillate on the shaft, plates car- 7 ried on the outer endofthe arm, the said plates being in spacedrelation to each other, telescopically assembled members having their inner endpivotally' connected to the said plates, antiefriction rings interposed between the telescopic sections, anti frictionr members 'rotatably mounted in the walls of: the said anti-friction rings and adapted to hold the telescopic members in spaced erel-ation to each other, and 'means for; com-' municating the motion of the telescopic members to the said anti-friction r1ngs..-

WILLIAM A. CAMPBELL. 

